With a count-up bezel, this allows you to see how much time has elapsed, especially for divers. Now with the countdown bezel, this allows you to see how much time is remaining. Since this is a pilot’s watch, this feature would help the pilot tracks remaining fuel, i.e. bingo fuel time.
Between the bezel and the dial of the Air Command: I’m simply in awe of the congruity between the bezel and the dial, which highlights just how meticulous Blancpain was in executing this fine piece: The level of attention to the little details is astounding: